From a671c595c031f6948060aa2ae67775c6da35bd86 Mon Sep 17 00:00:00 2001
From: Ville Rantanen <q@moonq.org>
Date: Sat, 19 Dec 2020 10:39:35 +0200
Subject: [PATCH] accept multiple filesnames to md5sum-update

---
 files/md5sum-update | 89 +++++++++++++++++++++++++++++----------------
 1 file changed, 57 insertions(+), 32 deletions(-)

diff --git a/files/md5sum-update b/files/md5sum-update
index 9d4556d..f26d388 100755
--- a/files/md5sum-update
+++ b/files/md5sum-update
@@ -2,57 +2,82 @@
 
 function helpexit() {
     echo 'Create or append md5sum list of files
-Usage: md5sum-update [-r] [list name]
+Usage: md5sum-update [-r] [-f list_name] [[files to check]]
   -r recursive
-  list name is md5sums.txt by default
+  -f list_name is md5sums.txt by default
+  If files to check omitted, list files in current folder
 
-  Check files with "md5sum -c m5sums.txt"
-  '
+  Check files with "md5sum -c md5sums.txt"
+  To update hashes, simply delete the md5sums file.
+    '
     exit
 }
 
 recursive=0
 list_name="md5sums.txt"
+paths=()
 for ((i=1; i<=${#@}; i++)) {
+    j=$(( i + 1 ))
     [[ "${!i}" = "-h" ]] && helpexit
     [[ "${!i}" = "--help" ]] && helpexit
     [[ "${!i}" = "-r" ]] && { recursive=1; continue; }
-    list_name="${!i}"
+    [[ "${!i}" = "-f" ]] && { list_name="${!j}"; i=$(( $i + 1 )); continue; }
+    paths+=("${!i}")
 }
+if [[ ${#paths[@]} -eq 0 ]]; then
+    paths+=(".")
+fi
 set -e
 echo "Updating: $list_name"
 test -f "$list_name" || touch "$list_name"
-
+updates_done=0
 _update() {
-  if [ "$file" = "$list_name" ]; then
-    return
-  fi
-  if test -d "$file"; then
-    echo "$file is a directory"
-    return
-  fi
-  if test -f "$file"; then
-    if grep -qF "  $file" "$list_name"; then
-      echo "$file: exist"
-    else
-      echo "$file: new"
-      md5sum "$file" >> "$list_name"
+    if [ "$1" = "$list_name" ]; then
+        return
+    fi
+    if [[ -L "$1" ]]; then
+        echo "$1 is a symlink"
+        return
+    fi
+    if test -d "$1"; then
+        echo "$1 is a directory"
+        return
+    fi
+    if test -f "$1"; then
+        if awk '{ print substr($0,35) }' "$list_name" | grep -qFx "$1"; then
+            echo "$1: exist"
+        else
+            echo "$1: new"
+            md5sum "$1" >> "$list_name"
+            updates_done=1
+        fi
     fi
-  fi
 }
-
 shopt -s globstar
 shopt -s nullglob
+for ((i=0; i<=${#paths[@]}; i++)) {
+    if [[ -d "${paths[$i]}" ]]; then
+        pathname="${paths[$i]}"
+        pathname="${pathname%%/}"
+        if [[ "$recursive" -eq 1 ]]; then
+            for file in "${pathname}"/**; do
+                file="${file#./}"
+                _update "$file"
+            done
+        else
+            for file in "${pathname}"/*; do
+                file="${file#./}"
+                _update "$file"
+            done
+        fi
+    fi
+    if [[ -f "${paths[$i]}" ]]; then
+        file="${paths[$i]}"
+        file="${file#./}"
+        _update "$file"
+    fi
+}
 
-if [[ "$recursive" -eq 1 ]]; then
-  for file in **; do
-    _update
-  done
-else
-  for file in *; do
-    _update
-  done
+if [[ $updates_done -eq 1 ]]; then
+    sort -k 2 -o "$list_name" "$list_name"
 fi
-
-
-sort -k 2 -o "$list_name" "$list_name"